EP1802722A1 - Insbesondere dreischichtig aufgebaute montageklebebänder auf basis von thermisch vernetzten, viskoelastischen acrylat-hotmelts - Google Patents
Insbesondere dreischichtig aufgebaute montageklebebänder auf basis von thermisch vernetzten, viskoelastischen acrylat-hotmeltsInfo
- Publication number
- EP1802722A1 EP1802722A1 EP05792143A EP05792143A EP1802722A1 EP 1802722 A1 EP1802722 A1 EP 1802722A1 EP 05792143 A EP05792143 A EP 05792143A EP 05792143 A EP05792143 A EP 05792143A EP 1802722 A1 EP1802722 A1 EP 1802722A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- adhesive
- layers
- polyacrylate
- layer
- viscoelastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/02—Homopolymers or copolymers of acids; Metal or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
- C09J2301/408—Additional features of adhesives in the form of films or foils characterized by the presence of essential components additives as essential feature of the adhesive layer
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2848—Three or more layers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31573—Next to addition polymer of ethylenically unsaturated monomer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31935—Ester, halide or nitrile of addition polymer
Definitions
- the invention describes a double-sided adhesive, in particular three-layer structured pressure-sensitive adhesive tape, as can be used in particular to achieve very durable bonding at high temperatures, and a method for its production.
- double-sided pressure-sensitive adhesive tapes are very often used to join two materials together.
- single-layered double-sided adhesive self-adhesive tapes and multilayer double-sided adhesive self-adhesive tapes are distinguished here.
- Transfer tapes are constructed in such a way that the pressure-sensitive adhesive layer contains no support and can only be coated with appropriate release materials, e.g. siliconized release papers or release liners. Transfer tapes can be covered on one or both sides with separating materials. Often siliconized release papers or foils are used on both sides to a different extent, so that the transfer tape can be easily wound into a roll and subsequently also be applied without problems. Transfer adhesive tapes are often used to tackify a wide variety of substrates with adhesive. This happens e.g. by laminating the transfer tape on the substrate. The release paper then remains as a cover of the pressure-sensitive adhesive layer in the product.
- appropriate release materials e.g. siliconized release papers or release liners.
- Transfer tapes can be covered on one or both sides with separating materials. Often siliconized release papers or foils are used on both sides to a different extent, so that the transfer tape can be easily wound into a roll and subsequently also be applied without problems.
- Transfer adhesive tapes are often used to tack
- Thinner transfer tapes are often produced from the solution using self-adhesive compositions, thicker transfer tapes with self-adhesive compositions from the melt or by the so-called UV polymerization.
- a prepolymerized syrup of acrylate monomials is coated between two UV-transparent, antiadhesive coated release films and crosslinked on the web by UV irradiation.
- the documents US Pat. No. 4,181,752, EP 084 220 A, EP 202 938 A, EP 277 426 A and US Pat. No. 4,330,590 may be mentioned by way of example.
- a disadvantage of this technology is the often high residual monomer content in the self-adhesive compositions. This is unacceptable for many applications. Transfer tapes filled with UV-impermeable aggregates can not be produced in this way.
- DE 43 03 183 A1 also describes a process for the preparation of thick pressure-sensitive adhesive layers, in particular for the production of self-adhesive high-performance adhesive articles.
- a mixture of starting monomers to be polymerized by means of UV radiation is mixed with a solvent-free, saturated photopolymerizable polymer which is thickened, whereupon this mixture is applied to a substrate which has a dehydrated finish and irradiated with UV rays.
- a disadvantage is the use of copolymerized or added photoinitiators, since the layers can yellow yellow and, when exposed to UV radiation before use, an often marked change in the adhesive properties is observed.
- Transfer tapes can be foamed or filled in order to improve the properties, in particular, for example, with regard to bonding to uneven substrates.
- DE 40 29 896 A1 describes a carrierless, double-sided self-adhesive tape comprising a pressure-sensitive adhesive layer of more than 200 ⁇ m thickness containing glass micro-beads of more than 1.5 g / cm 3 density. This should have a particularly good adhesion.
- a disadvantage is the high density of the glass beads used.
- Multi-layered double-sided adhesive tapes have advantages over the single-layered, since specific properties can be adjusted by the variation of the individual layers.
- a three-layer adhesive tape consisting of a carrier middle layer and two outer layers, can be constructed symmetrically or asymmetrically.
- the two outer layers can each be pressure-sensitive adhesive coatings or, for example, one layer a pressure-sensitive adhesive layer and the other layer a heat-activated adhesive.
- the carrier ie the middle layer, can be, for example, a film, a nonwoven fabric, a non-woven material or a foam film carrier Foams or foam-like carriers are often used when a high bond strength on uneven surfaces is required or when clearances are compensated should.
- closed-cell foam carriers based on PE (polyethylene), PU (polyurethane) or EVA (ethylvinyl acetate), which are double-sidedly adhesive-coated with synthetic rubber or acrylate adhesive, are often used.
- PE polyethylene
- PU polyurethane
- EVA ethylvinyl acetate
- Applications are listed by way of example the bonding of mirrors, moldings and emblems in vehicle construction, other uses in the automotive industry, as well as the use in the furniture industry or in household appliances.
- Outdoor installation tapes generally have polyacrlylate-based pressure-sensitive adhesives. This material is particularly weather-resistant and very durable, almost inert to UV light and against degradation by oxidation or ozonolysis.
- assembly tapes with middle layers of rubber styrene block copolymers and polyurethane. All of these materials do not have the good aging and heat resistance properties such as polyacrylate. Although systems based on acrylate block copolymers are resistant to aging, they are not heat-resistant enough for high-performance requirements since these systems are only physically crosslinked via styrene or methyl methacrylate domains. The PSAs soften upon reaching the softening temperature of the domains (as with styrene block copolymers). As a result, the bond fails.
- foam adhesive tapes can easily split. For example, if PE foam is used, then this material softens when heated to about 100 ° C and the bond fails. Such double-sided adhesive mounting tapes are unsuitable for high-quality applications. Although PU-based foams are more temperature-resistant, they tend to disappear under UV and sunlight irradiation. Again, they are often unsuitable for high performance requirements.
- This viscoelastic Acr ⁇ latkem is foamy.
- the foam-like structure is achieved by admixing glass or polymer hollow spheres in the acrylate composition, or the acrylate composition is foamed by means of expanding Adhesive adhesive compositions are provided adjacent to this viscoelastic layer, in most cases also based on acrylate, sel ⁇ th on synthetic rubber or in special cases on heat-activatable adhesive layers
- Adhesive adhesive compositions are provided adjacent to this viscoelastic layer, in most cases also based on acrylate, sel ⁇ th on synthetic rubber or in special cases on heat-activatable adhesive layers
- the advantages of the viscoelastic Acr ⁇ latkems arise on the one hand From the material properties of the polyacrylate (as already mentioned, these are a particular weathering resistance and longevity and largely inert behavior against UV light and against degradation by oxidation or ozonolysis.)
- the acrylate core layer for example as determined by the comono
- the viscoelastic acrylate core layer is produced by a process of two-stage UV polymerization.
- a mixture based on acrylate monomers for example 10% by weight of acrylic acid and 90% by weight of isooctyl acrylate, prepolymerized in the presence of a photoinitiator by UV irradiation in a reactor up to about 10-20% conversion.
- this "acrylic syrup” can also be obtained by thermally initiated free radical polymerization
- this acrylic syrup is coated between antiadhesive coated UV-transparent films and polymerized by means of renewed UV irradiation on the web to higher conversion and at the same time cross-linked.
- the finished three-layer product is obtained, for example, after laminating the pressure-sensitive adhesive coatings.
- UV-nontransparent fillers can not be used. Also remains due to the process, a high residual monomer content in these products. A possible reduction of residual monomer by reducing the speed of the broom or by intensive post-drying is not very economical. The maximum achievable layer thickness is very dependent on the wavelength of the photoinitiator used. Can be produced layers up to 1 mm, but with the disadvantages mentioned above. Even thicker layers are virtually impossible to win.
- UV crosslinking or by electron irradiation is a more or less pronounced crosslinking profile through the layer.
- the UV-crosslinked layer is increasingly crosslinked than on the side opposite the UV radiation source.
- the degree of the crosslinking profile is e.g. depending on the layer thickness, the wavelength of the photoinitiator used and also the wavelength of the emitted radiation of the UV radiation source.
- a disadvantage of viscoelastic acrylate carriers which have a crosslinking profile through the layer is their insufficient ability to distribute stresses evenly.
- a page is always either over- or under-linked.
- An exact balance between adhesive and cohesive properties is never adjustable for the entire layer, but only for a small section.
- ESH-crosslinked layers always have a crosslinking profile, depending on the layer thickness and the material. Even with them the exact networking setting is not possible. After all, the ESH crosslinking proceeds without added photoinitiators, so that some, but not all the disadvantages compared with the UV-irradiated layers, are turned off.
- the thickness of the irradiated layer can be varied. Layer thicknesses above about 500 microns, especially if they are filled with inorganic fillers such as glass beads, can not be irradiated economically. The achievable layer thicknesses are thus limited upwards.
- the object of the invention is therefore to provide an adhesive tape which contains a viscoelastic carrier layer based on acrylate, which no longer has the disadvantages mentioned and which is characterized by good adhesive properties, very good anchoring of the layers with each other and used particularly as Montageklebe ⁇ band can be.
- the adhesive tape should have the same properties throughout the carrier layer, ie in particular have no crosslinking profile.
- the object is achieved by a double-sided adhesive tape comprising at least one carrier layer and two adhesive layers, the carrier layer consisting of a photoinitiator-free homogeneously crosslinked polyacrylate, that is to say having no crosslinking profile through the layer.
- the cross-linked polyacrylate-based carrier layer is, in particular, one which is viscoelastic, that is to say exhibits behavior which flows onto a substrate and at the same time has at least partially elastic properties.
- a preferred embodiment of the invention is given by a three-layer adhesive tape containing as a viscoelastic support a photoinitiatorshots homogeneously thermally crosslinked Acrylathotmelt which is covered at least on one side, in particular on both sides with a pretreated, preferably corona-pretreated adhesive.
- the carrier layer is bonded to the layers of adhesive by chemi cal reaction.
- a barrier layer may be provided in each case between the carrier layer and one or both adhesive layers, in particular in order to prevent a possible migration of additives or chemical compounds.
- the features of the individually mentioned embodiments of the invention can also be combined with one another.
- the adhesive tape of the invention ie in particular the three-layer adhesive tape with a homogeneously crosslinked viscoelastic polyacrylate, obtained by the method described below:
- a polyacrylate copolymer (hereinafter simply referred to as "polyacrylate") based on Acryl Acidestem and / or Methacryl Acidestem is in the melt
- the polyacrylate provided with the crosslinker is conveyed to a coating unit, more preferably with an extruder, even more preferably with the compounding extruder, in which the crosslinker has already been added, and at least one thermal crosslinker in which, if appropriate, the concentration of the polyacrylate has already taken place, see the schematic representation in Figure 1, in which: 1.1 polyacrylate input, 1.2: crosslinker addition, 1.3: extruder, RW: doctor roller, BW: coating roller
- the mate ⁇ rial between two each pretreated, preferably corona pretreated surface on each one carrier material also referred to as a liner
- the crosslinking of the thus introduced polyacrylate takes place in the layer, wherein in particular the polyacrylate-added thermal crosslinking agent react with the remind ⁇ -treated boundary layer.
- the adhesives chemically bind to the resulting viscoelastic carrier layer. As a result, a good anchoring of carrier material (polyacrylate) and adhesive layers is achieved.
- processing time The time after metering of the crosslinking system in the compounding unit until the molding of the polyacrylate material which forms the carrier between the adhesives coated in particular on liners is referred to as processing time.
- the now crosslinking viscoelastic carrier layer can be coated gel-free and with optically good line pattern.
- the crosslinking then takes place mainly after coating on the web under mild conditions which do not damage either carrier or liner, ie in particular advantageously without the influence of actinic radiation such as additional UV light irradiation or electron beams.
- GD creates a homogeneously cross-linked layer, ie it has no cross-linking profile through the layer.
- Polyacrylates ie polymers based on at least some of acrylic acid esters and / or methacrylic acid esters, are used as base material for the, in particular, viscoelastic carrier layer.
- some of the acrylic esters and / or methacrylates preferably contain primary hydroxyl groups.
- the proportion of acrylic and / or methacrylic acid esters containing primary hydroxyl groups is, in a preferred procedure, up to 25% by weight, based on the polyacrylate.
- polyacrylate may also be advantageous for the polyacrylate to have partially copolymerized acrylic acid.
- the base used is preferably a polyacrylate which can be recycled to the following educt mixture: a1) acrylic acid esters and / or methacrylic acid esters of the following formula
- the monomers preferably chosen such that the resulting polymers have a glass transition temperature of - 40 have 0 C to +80 0 C, understood in the sense of dynami ⁇ 's glass transition temperature for amorphous systems and the melting temperature for semicrystalline systems, by dynamic mechanical analysis (DMA ) can be determined at low frequencies.
- DMA dynamic mechanical analysis
- T G glass transition temperature
- the monomers are very preferably selected in accordance with the above, and the quantitative composition of the monomer mixture is advantageously chosen such that according to an equation (G1 ) in analogy to the Fox equation (see TG Fox, Bull. Am. Phys Soc., 1 (1956) 123) gives the desired T G value for the polymer.
- n the number of runs via the monomers used
- W n the mass fraction of the respective monomer n (wt .-%)
- T G the respective glass transition temperature of the homopolymer of the respective monomers n in K.
- acrylic or methacrylic monomers which consist of acrylic and methacrylic acid esters having alkyl groups of 1 to 20 carbon atoms, preferably 4 to 9 carbon atoms, are used for a1).
- Specific examples are methacrylate, methyl methacrylate, ethyl acrylate, n-butyl acrylate, n-butyl methacrylate, n-pentyl acrylate, n-hexyl acrylate, n-heptyl acrylate, n-octyl acrylate, n-octyl methacrylate, n-nonyl acrylate, lauryl acrylate, stearyl acrylate, behenyl acrylate, and their branched isomers, such as Isobutyl acrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, I so
- Further compound classes to be used for a1) are monofunctional acrylates or methacrylates of bridged cycloalkyl alcohols, consisting of at least 6 C atoms.
- the cycloalkyl alcohols may also be substituted, e.g. by C 1-6 -alkyl groups, halogen atoms or cyano groups.
- Specific examples are cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate and 3,5-dimethyl adamantyl acrylate.
- a2) monomers are used which contain hydroxyl groups, very preferably primary hydroxyl groups.
- examples of a2) are hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, 6-hydroxyhexyl methacrylate, 4-hydroxystyrene, allyl alcohol, although this list is not exhaustive.
- Monomers for a3) are, for example, olefinically unsaturated monomers with functional groups such as Carboxylic acid groups, acid anhydride groups, phosphonic acid groups, amide or imide or amino groups, isocyanate groups, epoxy groups or thiol groups.
- Examples of a3) are acrylic acid or methacrylic acid, maleic anhydride, itaconic anhydride, itaconic acid, glyceryl methacrylate, glyceryl methacrylate, vinylacetic acid, .beta.-acryloyloxypropionic acid, trichloroacrylic acid, fumaric acid, crotonic acid, aconitic acid, acrylonitrile, dimethylacrylic acid, N, N-dialkyl-substituted amides, for example NN dimethylacrylamide, N 1 N- Dimethylmethylmethacrylamid, N-tert-butylacrylamide, N-vinylpyrrolidone, N-vinyllactam, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, diethylaminoethyl methacrylate, diethylaminoethyl acrylate, N-methylol methacrylamide, N- (
- macromonomers can also be polymerized into the polyacyrlate.
- Particularly suitable macromonomers as described in EP 1 361 260 A1, for example, 2-polystyrene ethyl methacrylate having a molecular weight Mw of 13,000 g / mol.
- the resulting crosslinked macromonomer-modified thermally crosslinked acrylate hotmelt are more shear resistant because they are physically and thermally crosslinked.
- polyacrylates particularly suitable for the further processing according to the invention as a carrier material are the polyacrylates, if they are prepared by bulk, solution or emulsion polymerization and optionally subsequently, in particular if they comply with volatile constituents, be concentrated.
- concentration may conveniently be carried out in a vented extruder, in particular analogously to DE 102 21 402 A1, page 3, lines 22-68.
- the polyacrylates have a weight-average molecular weight M w of at least 300,000 g / mol to a maximum of 1,500,000 g / mol.
- the determination of the average molecular weight is carried out by size exclusion chromatography (GPC) or matrix-assisted laser desorption / ionization mass spectrometry (MALDI-MS).
- GPC size exclusion chromatography
- MALDI-MS matrix-assisted laser desorption / ionization mass spectrometry
- the polymerization time is - depending on the conversion and temperature - between 2 and 72 hours.
- polyacrylates which have a narrow molecular weight distribution (polydispersity ⁇ 4). These compounds become particularly shear-resistant at a relatively low molecular weight after crosslinking. Since, compared to a normally distributed polyacrylate, a lower molecular weight is required for a narrowly distributed polyacrylate at the same cohesion level, viscosity and process temperatures are reduced. Thus, a tightly distributed polyacrylate allows a particularly long processing time.
- Narrowly distributed polyacrylates can be prepared by anionic polymerization or by controlled radical polymerization, the latter being particularly well suited. Examples are described in US 6,765,078 B2 and DE 10036901 A1 and US 2004/0092685 A1. Atomic Transfer Radical Polymerization (ATRP) can also be used advantageously for the synthesis of narrowly distributed polyacrylates, monofunctional or difunctional secondary or tertiary halides being used as the initiator, and for the abstraction of the halide (s) Cu, Ni.
- ATRP Atomic Transfer Radical Polymerization
- plasticizers, resins and fillers can also be added to the viscoelastic acrylate layer.
- Suitable fillers are hydrophilic or hydrophobic silica gels such as aerosils or ultrasils, inorganic fillers such as chalk, titanium dioxide, calcium and barium sulfate but also organic fillers such as polymer beads or fibers based on cellulose, polyethylene, polypropylene, polyamide, polyacrylonitrile, polyester, polymethacrylate and / or polyacrylate.
- flame-retardant fillers such as Ammoniumpolyphos ⁇ phat
- electrically conductive fillers such as Leitruß, carbon fibers and / or silver-coated balls
- Ferromag netic additives such as example, iron (lll) oxides
- further additives for the production of foamed layers such as, for example, blowing agents, glass beads, glass bubbles, expandable microballoons, protection agents, light stabilizers, antiozonants before or after the Aufkonzentra ⁇ tion of Polyacr ⁇ lat be added or compounded.
- plasticizers can be added in concentrations of up to 3% by weight.
- plasticizers e.g. low molecular weight polyacrylates, phthalates, water-soluble plasticizers, soft resins, phosphates or polyphosphates are added.
- the addition of the additives can be done before or after the concentration of the polyacrylate.
- these can be additionally filled and / or foamed.
- the glassy spheres, hollow glass spheres or expanding microballoons are added to the polyacrylate, preferably before the addition of the thermal crosslinking agent.
- a thermal crosslinker is added to the polyacrylate.
- the added thermal crosslinker is an isocyanate, preferably a trimerized isocyanate.
- the trimerized isocyanates are aliphatic or amine-deactivated isocyanates.
- Suitable isocyanates are, in particular, trimerized derivatives of MDI [4,4-methylenedi (phenyl isocyanate)], HDI [hexamethylene diisocyanate, 1,6-hexylene diisocyanate] and / or IPDI [isophorone diisocyanate, 5-isocyanato-1-isocyanatoethyl-1,3,3- tri- methylcyclohexane], for example the types Desmodur® N3600 and XP2410 (in each case BAYER AG: aliphatic polyisocyanates, low-viscosity HDI trimers). Also very suitable is the surface-deactivated dispersion of micronized trimerized IPDI BUEJ 339®, now HF9® (BAYER AG).
- isocyanates such as Desmodur VL 50 (polyisocyanates based on MDI, Bayer AG), Basonat F200WD (aliphatic polyisocyanate, BASF AG), Basonat HW100 (water-emulsifiable polyfunctional isocyanate based on HDI, BASF AG) , Basonat HA 300 (allophanate-modified polyisocyanate on isocyanurate, HDI-based, BASF) or Bayhydur VPLS2150 / 1 (hydrophilic modified IPDI, Bayer AG), although this list is not exhaustive.
- the addition of the thermal crosslinker to the polyacrylate takes place in the melt, preferably under precise temperature and time control.
- the addition and incorporation of the thermally reactive crosslinking system into the polyacrylate matrix preferably takes place in continuous compounding aggregates.
- These units are inventively designed so that with good mixing and at the same time low input of shear energy a short residence time of the mass is ensured after dosing of the crosslinking system.
- the compounding units are preferably extruders, in particular twin-screw and / or planetary roller extruders. It is particularly advantageous if the spindles of the extruder can be tempered and / or cooled.
- the addition may take place in the extruder in which the polyacrylate composition has already been concentrated.
- the crosslinkers are added at one or more points of the aggregates, preferably in pressure-free zones. It is also advantageous if the thermally reactive crosslinking substances are added in finely divided form to the polyacrylate, for example as an aerosol, in fine droplets or diluted in a suitable diluent such as a polymer-compatible plasticizer.
- the residual monomer content in the polyacrylate for the carrier layer upon addition of the thermal crosslinker is not more than 1% by weight, in particular not more than 0.3% by weight, based on the polyacrylate.
- the residual solvent content in the polyacrylate for the carrier layer after concentration and upon addition of the thermal crosslinker is not more than 1 wt .-%, in particular not more than 0.3 wt .-%, based on the polyacrylate.
- thermo crosslinker in particular the trimerized isocyanate
- 0.1 to 5 wt .-% in particular 0.2 to 1 wt .-%, based on the polyacrylate, is used.
- the temperature of the polyacrylate for the carrier layer when adding the thermal Ver ⁇ network between 60 0 C and 120 0 C, more preferably between 70 0 C and 100 0 C.
- the polyacrylate melt added with the crosslinker is transported to a coating unit, preferably directly through the extruder, in which the addition of the crosslinker and possibly already the concentration of the mass has already taken place.
- a coating unit preferably directly through the extruder, in which the addition of the crosslinker and possibly already the concentration of the mass has already taken place.
- pressure-sensitive adhesive coatings are added on both sides of the crosslinked, ie not yet completely crosslinked, viscoelastic carrier layer pretreated, in particular corona-pretreated.
- reactive isocyanate groups in the support layer can react with the hydroxy functionalities of the pressure-sensitive adhesive layers to be coated. This positively influences crosslinking. Even otherwise very poorly anchored masses can be connected to the viscoelastic support layer.
- PSAs are very preferably used in accordance with the invention.
- a pretreated, in particular corona-pretreated, polyacrylate layer is laminated on both sides.
- adhesive layers pretreated by other methods in particular based on acrylate, if functional groups are present in these adhesives and / or are formed by the pretreatment which enters chemical bonds with isocyanate groups.
- Particularly preferred pressure-sensitive adhesives are pure acrylate compositions or those which contain no migrable components such as resins or plasticizers in any appreciable concentration. Very preference is given to pure acrylate PSAs which have been previously coated on silicone-based polyester liners.
- hot-melt adhesive layers or heat-reactable layers which are preferably laminated on one side to the viscoelastic layer are also suitable. This results in products with asymmetric structure.
- suitable base polymers for adhesives are natural rubber, synthetic rubbers, acrylate block copolymers, styrene block copolymers, EVA, many polyolefins, polyurethanes, polyvinyl ethers, and silicones.
- the release-coated adhesives can be pretreated by any known physical or chemical process which forms reactive groups capable of reacting with isocyanates.
- all known methods of priming can be used, whereby the primer layers can be applied to the adhesive layers both from solutions or from dispersions.
- the application can also be made by extrusion or coextrusion.
- Preferred physical methods are flame treatment, corona pretreatment, atmospheric plasma pretreatment or vacuum plasma treatment.
- the corona pre-treatment is directly before the lamination of the still reactive viscoelastic carrier layer.
- a barrier layer for example of polyamide
- the barrier layer is then advantageously applied to an adhesive previously coated on a release material, then pretreated on the barrier layer side according to the methods described above and laminated to the still reactive viscoelastic carrier layer.
- the barrier layer can be applied to the viscoelastic carrier layer and then coated with the adhesive.
- the viscoelastic carrier layer is only crosslinked, but not yet sufficiently crosslinked.
- Beschich ⁇ processing means in this context, the molding of mixed with crosslinker, largely solvent-free carrier mass into corresponding layers and applications between the applied to sheet material pretreated adhesive layers.
- the degree of crosslinking at this point in time must therefore only be so far advanced that the processability of the PSA, in particular with regard to a good broom shape, is still guaranteed.
- the processing time is 3 to 30 minutes, preferably 5 to 20 minutes, more preferably 5 to 10 minutes.
- the structure of the three-layer system adhesive composition polyacrylate carrier adhesive is preferably carried out via a two-roll system (cf., FIG. 2).
- a distributor nozzle (1) or another suitable unit By means of a distributor nozzle (1) or another suitable unit, the viscoelastic mass (3) which is finally compounded with the crosslinker and optionally with fillers and forms the later carrier material is fed to the nip and there between the two adhesive mass layers (6a, 6b).
- a corona treatment (8) (preferably to be adjusted corona conduction: 10 to 200 W min / m 2 , preferably 30-160 W min / m 2 , very preferably 80-120 W min / m 2 ) introduced.
- the adhesives coated in particular on anti-adhesive auxiliary carriers (7a, 7b) are introduced into the apparatus via the rollers W1 and W2, in such a way that the adhesive sense faces are facing each other.
- the shaping of the viscoelastic mass into a viscoelastic film takes place between the calender rolls W1 and W2 in the nip, and at the same time coating with the two supplied adhesives (6a, 6b) occurs.
- the pretreatment of the adhesives in particular within a corona station (8), serves for better anchoring of the adhesives on the molded, viscoelastic carrier layer. By this treatment, active OH groups are formed on the surface of the adhesives which, after the production of the three-layer composite, lead to an improved chemical attachment to the viscoelastic carrier layer.
- the width of the nip and the pressure of the rollers while the layer thickness of the carrier is determined.
- the method described above is particularly suitable for producing viscoelastic three-layer constructions with layer thicknesses between 100 ⁇ m and 10,000 ⁇ m, preferably between 300 ⁇ m and 5,000 ⁇ m, with production speeds between 0.5 m / min and 100 m / min.
- the surface temperatures of the rolls are adjusted depending preferably on the used visko ⁇ elastic masses and anti-adhesive carrier material is between 25 ° C and 200 0 C, more preferably between 60 0 C and 150 0 C and more preferably between 80 ° C and 120 ° C , Suitable surfaces for the two calender rolls used are all materials familiar to the person skilled in the art, such as steel, chromium-plated steel, stainless steel, plastics, silicones, ceramics and combinations of the abovementioned materials.
- the mass bead rotating in the nip does not mix with the supplied adhesives.
- the adhesive dissolves at least partially from the anti-adhesive equipped carrier and mixed with the rotating bulge.
- the crosslinking reaction in particular with isocyanates, preferably proceeds without catalysis.
- the reaction preferably proceeds with aromatic and / or aliphatic isocyanates at slightly elevated temperatures.
- the reaction rate is faster.
- a process-stable process preferably with the slower-reacting aliphatic isocyanates or surface-deactivating isocyanate emulsions, succeeds.
- the crosslinking reaction proceeds completely even without heat supply under normal conditions (room temperature).
- room temperature normal conditions
- the crosslinking reaction with the multifunctionalized isocyanate is largely completed and the final cohesion of the composition is achieved after up to 14 days, in particular four to ten days' storage.
- this binds the viscoelastic carrier layer chemically to the adhesive covering layers to be laminated.
- Crosslinking with isocyanates forms urethane groups which link the polymer chains.
- the combination increases the cohesion of the viscoelastic carrier layer and thus the shear strength of the product.
- the physical properties of the viscoelastic carrier and of the end product can be influenced by the degree of crosslinking in addition to the comonomers and, if appropriate, fillers, so that by suitable choice of the reaction conditions Optimize end product.
- Various factors determine the process window of this process. The most important influencing variables are, especially in the case of unmixed systems, process and coating temperature, residence time in compounding extruder and coating unit, crosslinker type (deactivated, aliphatic, aromatic), crosslinker concentration, proportion of hydroxyl groups in the polymer, proportion of copolymerized acid groups in the polymer, and average molecular weight of the polyacrylate.
- the mass or the shaped layer is advantageously activated in a suitable manner by means of heat input.
- a corona-pretreated polyacrylate layer can then be laminated on both sides to this foamed layer.
- the foamed layer is smoothed by laminating the corona-treated pressure-sensitive adhesive layers or separately, for example, by rolling.
- the adhesive tape according to the invention exhibits excellent properties due to the combination of the carrier and adhesive formulations, which were thus not anticipated by the person skilled in the art, so that its use is possible, in particular, as assembly adhesive tape for high-performance requirements. This is especially true for the design as a self-adhesive tape.
- the inventive advantages are significant especially at application temperatures between 100 and 130 ° C.
- the plasticizer resistance is outstanding because of the very good anchoring and homogeneous cross-linking.
- the bond strength on plasticized substrates remains high even after storage, the anchoring of the layers with each other very well. Delamination of the layers is not observed even after storage against plasticizer-containing substrates.
- Due to the high flexibility of the carrier the tape adapts very well to uneven surfaces. The result is a permanent bond between the adhesive tape and Unter ⁇ reason, which does not fail even at high shear forces and bending moment stresses, even at high temperatures and even after storage under UV irradiation and humidity.
- Such an adhesive tape can be used, for example, in the furniture industry, where mirrors, strips or panels are to be permanently bonded. Because of the outstanding product properties, the use is also advantageous in many industrial sectors as a mounting material if different surfaces, in particular UV-transparent, such as window glass or transparent plastics, are to be permanently bonded together.
- the adhesive performance on each side is equally good.
- the adhesive properties of the respective sides are the same.
- the viscoelastic supports show no cross-linking profile through the layer.
- the viscoelastic carrier layer can be particularly thick, because in principle this method does not show any visual confinement in contrast to crosslinking via UV or ESH irradiation.
- filled and foamed viscoelastic layers can also be produced.
- the mass or the shaped layer is preferably activated by heat input in a suitable manner.
- a corona-pretreated polyacrylate layer can then be laminated on both sides to this foamed layer.
- the foamed layer is expediently smoothed by laminating the corona-pretreated adhesive layers or separately, for example, between two rollers.
- any desired filled and colored layers can be obtained.
- the residual monomer content of the viscoelastic layers, as well as of the entire three-layer product is very low.
- Particularly advantageous is the possibility of the homogeneously crosslinked viscoelastic acrylate of the three-layer double-sided equipped with adhesive To be able to produce adhesive tape with coating speeds of above 50, preferably 100 m / min.
- the adhesive tape according to the invention which is present as an intermediate product can then be further adapted or improved by additional irradiation by means of actinic radiation (for example UV light or electron beams).
- actinic radiation for example UV light or electron beams.
- the solids content is a measure of the proportion of non-evaporable in a Polymer ⁇ solution. It is determined gravimetrically by weighing the solution, then for 2 STUN the at 120 0 C in a drying cabinet evaporating the volatile fractions and weighing the residue again.
- the K value is a measure of the average molecular size of high polymer substances.
- one percent (1 g / 100 ml) of toluene polymer solutions were prepared and determined with the aid of a VOGEL OSSAG Viskositmeters their kinematic viscosities. After normalization to the viscosity of the toluene, the relative viscosity is obtained, from which, according to FIKENTSCHER, the K value can be calculated (Polymer 8/1967, 381 ff.).
- the determination of the average molecular weight M w and the polydispersity PD was carried out by the company Polymer Standards Service in Mainz.
- the eluent used was THF containing 0.1% by volume of trifluoroacetic acid.
- the measurement was carried out at 25 ° C.
- the precolumn used was PSS-SDV, 5 ⁇ , 10 3 A, ID 8.0 mm ⁇ 50 mm.
- the columns PSS-SDV, 5 ⁇ , 10 3 and 10 5 and 10 6 were used , each with ID 8.0 mm x 300 mm.
- Samples- concentration was 4 g / l, the flow rate 1.0 ml per minute. It was measured against PMMA standards.
- the bond strength was measured with a Zwick tensile testing machine.
- the open side of the transfer tape is first laminated against the 50 micron aluminum foil, removed the release material and glued plate on the Stahl ⁇ , rolled and measured analog.
- the results of both sides, open and covered, are given in N / cm and are averaged out of three measurements.
- the sample preparation was carried out in a test climate of 23 0 C +/- 1 0 C room temperature and 50% +/- 5% rel. Humidity.
- the test piece was cut to 13 mm and glued to a steel plate.
- the bond area is 20 mm x 13 mm (length x width).
- the steel plate was cleaned and conditioned. For this purpose, the plate is first wiped with acetone and then left for 5 minutes in the air, so that the solvent can evaporate.
- the open side was reinforced with a 50 ⁇ m aluminum foil and rolled over twice with a 2 kg roller. Subsequently, a belt loop was attached to the projecting end of the transfer tape. The whole was then hung on a suitable device and loaded with 10 N.
- the suspension device is designed so that the weight loads the sample at an angle of 179 ° +/- 1 °. This ensures that the transfer tape can not peel off from the lower edge of the plate.
- the measured shear time, the time between hanging and falling off of the pattern, is given in minutes and equals the mean of three measurements.
- the open side is first reinforced with the 50 ⁇ m aluminum foil, the separating material is removed and adhered to the test plate analogously to the description. The measurement is carried out under normal conditions (23 ° C, 55% humidity).
- Rolling Ball Test measured the tack of the samples with a very short contact time. The measurement was carried out in a test climate of 23 ° C +/- 1 ° C room temperature and 50% +/- 5% rel. Humidity. The transfer tape was fixed with the side to be checked upwards under slight tension on the exactly horizontal worktop. Subsequently, a 65 mm high ramp was placed on the sample strip and a clean, acetone-cleaned and 5.6 g heavy ball rolled down. The distance between the leading edge of the ramp and the ball center of the rolled-out sphere was measured. Indicated is the average of 5 measurements per page.
- the SAFT test is a quick test of the short-term temperature resistance of the transfer tapes.
- the samples were reinforced with a 50 .mu.m aluminum foil and glued remaining Klebe ⁇ page on a ground, cleaned with acetone steel test plate and then rolled over ßur with a 2 kg steel roll and a speed of 10 m / min six times.
- the bond area of the sample was, height x width, 13 mm x 10 mm.
- the sample to be measured was loaded at the lower end with a weight of 50 g.
- the steel test plate with the bonded sample was then heated starting at 25 0 C, at a rate of 9 ° C per minute to the final temperature of 200 ° C.
- the slip path of the sample was measured by means of a distance sensor as a function of temperature and time. The measurement was terminated when the intended final temperature was reached or when a sliding distance of> 1000 ⁇ m was reached.
- the SAFT test can provide two test characteristics: SAFT Scherweg or SAFT short-term temperature stability.
- the SAFT shear path is the sliding distance in ⁇ m when the final temperature is reached.
- the SAFT short-term temperature resistance is the temperature at which a Slip distance of 1000 microns is achieved. Both sides were measured; the open and the covered side. The mean value of a double determination is given in each case.
- FIG. 3 shows the preparation of the polyacrylate pressure-sensitive adhesive layers (layer A and / or C).
- a 30 mm x 30 mm test specimen (3.1) fixed between two polished steel plates (3.2) is pressed with 0.9 kN for 1 minute (force P).
- a 9 cm long lever arm (3.3) is screwed into the top steel plate and this then loaded with a 1000 g weight (3.4). It is ensured that the time between pressing and loading is not more than two minutes (t ⁇ 2 min).
- the holding time is measured, ie the time between hanging up and falling off the pattern. As a result, the holding time in minutes is given as the mean value of a triple determination.
- the test climate is 23 0 C +/- 1 0 C and 50% RH +/- 5% RH (RH relative humidity).
- Polyacrylate Adhesive 1 (PA1): A conventional 100 L glass reactor for free-radical polymerizations was mixed with 2.8 kg of acrylic acid, 8.0 kg of methyl acrylate, 29.2 kg of 2-ethylhexyl acrylate and 20.0 kg of acetone / isopropanol (95: 5 ). After passing nitrogen gas through with stirring for 45 minutes, the reactor was heated to 58 ° C. and 20 g of azoisobutyronitrile (AIBN, Vazo 64®, DuPont) were added. Subsequently, the outer heating bath was heated to 75 0 C and the reaction was carried out constantly at this external temperature. After 1 h reaction time 20 g of AIBN was added again.
- AIBN azoisobutyronitrile
- the polyacrylate was then mixed with 0.4% by weight of aluminum (III) acetylacetonate (3% strength solution of isopropanol), diluted to a solids content of 30% with isopropanol and then coated from solution onto a siliconized release film (50 ⁇ m polyester) , (Coating speed 2.5 m / min, drying channel 15 m, temperatures zone 1: 40 ° C, zone 2: 70 ° C, zone 3: 95 ° C, zone 4: 105 "C), the application rate was 50 g / m 2 , Polyacrylate adhesive 2 (PA2):
- a conventional 100 L steel reactor for free-radical polymerizations was charged with 4.0 kg of acrylic acid, 36.0 kg of 2-ethylhexyl acrylate and 13.3 kg of acetone / isopropanol (96: 4). After 45 minutes, passing nitrogen gas while stirring the reactor at 58 0 C naval ⁇ was heated, and 20 g of azoisobutyronitrile (AIBN, Vazo 64®, Fa. DuPont) were added. Subsequently, the outer heating bath was heated to 75 0 C and the reaction was carried out constantly at this external temperature. After 1 h reaction time 20 g of AIBN was added again.
- AIBN azoisobutyronitrile
- HEMA hydroxyethyl methacrylate
- AIBN [2,2'-azobis (2-methylbutyronitrile)]
- Perkadox 16 bis (4-t-butylcyclohexyl) peroxydicarbonate
- Example 1 As in Example 1, 36.0 kg of 2-ethylhexyl acrylate, 21.0 kg of tert-butyl acrylate, 2.4 kg of acrylic acid and 0.6 kg of HEMA were polymerized in 40 kg of acetone / isopropanol (93: 7). It was initiated twice with 30 g of AIBN, twice with 90 g of Perkadox 16 and diluted with 10 kg of acetone / isopropanol mixture (93: 7). After a reaction time of 22 hours, the polymerization was stopped and cooled to room temperature.
- a reactor conventional for radical polymerizations was charged with 36 kg of 2-ethylhexyl acrylate, 21 kg of tert-butyl acrylate, 2.4 kg of acrylic acid, 0.6 kg of HEMA, 40 g of dithiobenzoic acid benzyl ester and 40 kg of acetone. 45-minute after passage of Stickstoff ⁇ gas with stirring, the reactor was heated to 58 0C and added 30 g AIBN. Subsequently, the outer heating bath was heated to 75 ° C and the reaction was constant at this outside temperature is performed. After 1 h, 30 g of AIBN were again added. After 4 h, it was diluted with 5 kg of acetone.
- the hydroxy group-functionalized acrylate copolymers (base polymer 1 - 4) are largely freed from the solvent by means of a BERSTORFF single-screw extruder (concentrating extruder).
- concentration of the base polymer 1 are shown here.
- the speed of the screw was 160 U / min, the motor current 16 A, it was a throughput of 61, 5 kg liquid / h realized.
- a vacuum was applied to 3 different domes.
- the negative pressures were respectively 440 mbar, 50 mbar and 5 mbar with the lowest vacuum applied in the first dome.
- the exit temperature of the concentrated hot melt was 104 ° C.
- the solids content after this concentration step was 99.8%.
- the acrylate polymers concentrated by process 1 were melted in a feed extruder (single screw extruder from TROESTER) and conveyed with this as polymer melt into a twin-screw extruder (LEISTRITZ, Germany, designation LSM 30/34).
- the unit is electrically heated from the outside and air-cooled by different fans.
- the geometry of the mixing screws was chosen so that at the same time a short residence time of the acrylate in the extruder is ensured with good distribution of the fillers and the crosslinking system in the polymer matrix.
- the mixing shafts of the twin-screw extruder were arranged so that alternating and mixing elements alternate.
- the fillers and the respective crosslinking system are added with suitable metering equipment, if appropriate at several points into the pressure-free conveying zones of the twin-screw extruder. Dosage auxiliaries are optionally used for dosing the crosslinking system. If desired, a vacuum pump can be connected to the twin-screw extruder in order to free the compounded self-adhesive from gas inclusions. The finished compounded acrylate mass is then followed by a mixing extruder downstream Melt pump fed to a distribution nozzle that promotes the viscoelastic carrier in the first nip of the coating calender.
- compositions according to the invention are coated by means of 2-roll calenders according to one of the methods described below.
- the viscoelastic mass (3) which has been finally compounded with the crosslinking system and optionally fillers is supplied to the nip.
- the shaping of the viscoelastic mass into a viscoelastic film takes place between the calender rolls (W1) and (W2) in the roll gap between two self-adhesive compositions (7a, 7b), which in turn are coated on anti-adhesively equipped carrier materials (5a, 5b) become.
- the viscoelastic composition is shaped to the set layer thickness and coated with the two supplied self-adhesives.
- the self-adhesive compositions are coronated by means of a corona station (8) before being fed into the nip (Corona plant from VITAPHONE, Denmark, 100 W min / m 2 ).
- This treatment gives rise to active OH groups on the surface of the self-adhesive compositions which, after the preparation of the three-layer composite, lead to improved chemical bonding to the viscoelastic carrier layer.
- the web speed when passing through the coating system is 40 m / min.
- the base polymer B1 was concentrated according to process 1 (solids content 99.7%) and then mixed according to process 2 with 1.6% by weight (based on acrylate copolymer) of the trimerized aliphatic diisocyanate Desmodur XP 2410 (BAYER AG, Germany).
- the trimerized diisocyanate nat with the liquid phosphate ester REOFOS 65 (GREAT LAKES, USA) in the ratio 1 to 3 diluted.
- the process parameters are summarized in Table 1.
- the coating between the previously coated on siliconized polyester films Masse ⁇ layers PA 1 is carried out on 2-Walzenêtswerk at roll temperatures of 100 ° C according to method 3.
- the layer thickness of the viscoelastic carrier VT 1 was 825 microns.
- the Corona essence was 100 W min / m 2 .
- the base polymer B1 was concentrated in accordance with process 1 (solids content 99.7%) and, analogously to example 1, mixed with 0.8% by weight (based on acrylate copolymer) of the trimerized aliphatic diisocyanate Desmodur XP 2410 (BAYER AG, Germany). Subsequently, as in Example 1, in each case previously coated on siliconized polyester films mass layers PA 1 at the 2-Walzendozensstechnik Ver ⁇ 3 coated. The layer thickness of the viscoelastic carrier VT 2 was 800 ⁇ m. The Corona essence was 100 W min / m 2 . After 7 days of room temperature storage, the adhesive data of the open and covered sides were measured. The data of Example MT 2 are summarized in Table 2.
- Base polymer B1 was concentrated by process 1 (solids content 99.7%) and then by process 2 with 6.5% by weight hollow glass spheres Q-CEL 5028 (from Potters Industries) and 2.13% by weight (based on acrylate copolymer) of the hydrophilic , aliphatic polyisocyanate Bayhydur VP LS 2150/1 (BAYER AG, Germany) blended.
- the process parameters are summarized in Table 1.
- the coating between the previously coated onto siliconized polyester films PA ground layers 1 is carried out on a 2-roll applicator at roll temperatures of 100 0 C according to method 3.
- the layer thickness amounted the viscoelastic carrier VT 3865 microns.
- the Corona essence was 100 W min / m 2 .
- Example MT 3 After 7 days of room temperature storage, the adhesive data of the open and covered sides were measured.
- the data of Example MT 3 are summarized in Table 2.
- Base polymer B2 was concentrated by process 1 (solids content 99.7%) and then by process 2 with 18% by weight of microsoluble chalk (MS40, from Söhlde) and 0.19% by weight (based on acrylate copolymer) of the hydrophilic aliphatic polyisocyanate - Anats Bayhydur VP LS 2150/1 (BAYER AG, Germany) blended.
- the process parameters are summarized in Table 1.
- the coating between the previously coated onto siliconized polyester films PA ground layers 1 is carried out on a 2-roller application at roll temperatures of 100 0 C according to method 3.
- the layer thickness of the viscoelastic carrier VT 4 was 790 microns.
- the Corona essence was 100 W min / m 2 . After 7 days of room temperature storage, the adhesive data of the open and covered sides were measured.
- the data of Example MT 4 are summarized in Table 2.
- the base polymer B3 was concentrated according to process 1 (solids content 99.8%) and then according to process 2 with 3 wt% unexpanded hollow microspheres Expancel 092 DU 40 (Akzo Nobel, Germany) and 1, 0 wt% (based on acrylate copolymer) of the trimerized aliphatic diisocyanate Desmodur XP 2410 (from BAYER AG, Germany).
- the process parameters are summarized in Table 1.
- the mixture was expanded in the extruder and subsequently coated between the previously coated on siliconized polyester films mass layers PA 1 according to method 3 at roll temperatures of 130 ° C.
- the layer thickness of the expanded viscoelastic carrier VT 5 was 740 ⁇ m.
- the Corona antique for pretreatment of the pressure-sensitive adhesive layers was 100 W min / m 2 .
- Example MT 5 After 7 days of room temperature storage, the adhesive data of the open and covered sides were measured.
- the data of Example MT 5 are summarized in Table 2.
- the base polymer B6 was concentrated according to process 1 (solids content 99.8%) and then according to process 2 with 5% by weight hydrophobized silica gel Aerosil R 972 (Degussa, Germany) and 1.0% by weight (based on acrylate copolymer) of trime ⁇ mixed aliphatic diisocyanate Desmodur XP 2410 (BAYER AG, Germany) blended.
- the process parameters are summarized in Table 1.
- Subsequently was coated between the previously coated on siliconized polyester films mass layers PA 1 according to method 3 at roll temperatures of 100 ° C.
- the layer thickness of the viscoelastic carrier VT 6 was 750 ⁇ m.
- the Corona antique for Vorbe ⁇ treatment of the pressure-sensitive adhesive layers was 100 W min / m 2 . After 7 days of room temperature storage, the adhesive data of the open and covered sides were measured.
- the data of Example MT 6 are summarized in Table 2.
- the described viscoelastic carrier compositions can be coated within a certain period of time after crosslinker dosing and compounding.
- the processing time is highly dependent on the molecular weight and hydroxy functionalization of the polyacrylate composition, as well as the type and amount of crosslinking system used and the prevailing process conditions such as melt temperature and geometric condition of the compounding.
- the inventive double-sided adhesive assembly tapes have very good adhesive data. Particularly positive is the aus ⁇ weighed adhesive profile of the respective pages. With the same layer of adhesive on both sides of the adhesive tape, these show almost the same adhesive technical data. This shows the homogeneous cross-linking through the layer. This is obvious to the person skilled in the art. In addition, these three-layer adhesive tapes show no delamination. The anchoring of the layers with one another is very good due to the corona treatment of the pressure-sensitive adhesive layers and the postcrosslinking of the adjoining viscoelastic carrier layer.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
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EP09151852.2A EP2062951B1 (de) | 2004-09-09 | 2005-09-09 | Dreischichtig aufgebaute Montageklebebänder auf Basis von thermisch vernetzten, viskoelastischen Acrylat-Hotmelts |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004044086A DE102004044086A1 (de) | 2004-09-09 | 2004-09-09 | Thermisch vernetzte Acrylat-Hotmelts |
PCT/EP2005/054508 WO2006027389A1 (de) | 2004-09-09 | 2005-09-09 | Insbesondere dreischichtig aufgebaute montageklebebänder auf basis von thermisch vernetzten, viskoelastischen acrylat-hotmelts |
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EP09151852.2A Division EP2062951B1 (de) | 2004-09-09 | 2005-09-09 | Dreischichtig aufgebaute Montageklebebänder auf Basis von thermisch vernetzten, viskoelastischen Acrylat-Hotmelts |
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EP1802722A1 true EP1802722A1 (de) | 2007-07-04 |
EP1802722B1 EP1802722B1 (de) | 2009-02-04 |
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EP09151852.2A Active EP2062951B1 (de) | 2004-09-09 | 2005-09-09 | Dreischichtig aufgebaute Montageklebebänder auf Basis von thermisch vernetzten, viskoelastischen Acrylat-Hotmelts |
EP05784719A Active EP1791922B1 (de) | 2004-09-09 | 2005-09-09 | Verfahren zur herstellung eines klebebandes mit thermisch vernetzter acrylatschmelzkleber-schicht |
EP20090156170 Ceased EP2067834A1 (de) | 2004-09-09 | 2005-09-09 | Trägerloses, homogen vernetztes Selbstklebeband, insbesondere Transferklebeband |
EP05782571A Active EP1791921B1 (de) | 2004-09-09 | 2005-09-09 | Verfahren zur Herstellung von TRÄGERLOSEn, HOMOGEN VERNETZTEn SELBSTKLEBEBändern, INSBESONDERE TRANSFERKLEBEBändern |
EP20050792143 Active EP1802722B1 (de) | 2004-09-09 | 2005-09-09 | Verfahren zur herstellung von montageklebebänder mit einer trägerschicht auf basis von thermisch vernetzten, viskoelastischen acrylaten |
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EP09151852.2A Active EP2062951B1 (de) | 2004-09-09 | 2005-09-09 | Dreischichtig aufgebaute Montageklebebänder auf Basis von thermisch vernetzten, viskoelastischen Acrylat-Hotmelts |
EP05784719A Active EP1791922B1 (de) | 2004-09-09 | 2005-09-09 | Verfahren zur herstellung eines klebebandes mit thermisch vernetzter acrylatschmelzkleber-schicht |
EP20090156170 Ceased EP2067834A1 (de) | 2004-09-09 | 2005-09-09 | Trägerloses, homogen vernetztes Selbstklebeband, insbesondere Transferklebeband |
EP05782571A Active EP1791921B1 (de) | 2004-09-09 | 2005-09-09 | Verfahren zur Herstellung von TRÄGERLOSEn, HOMOGEN VERNETZTEn SELBSTKLEBEBändern, INSBESONDERE TRANSFERKLEBEBändern |
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US (5) | US7910163B2 (de) |
EP (5) | EP2062951B1 (de) |
CN (5) | CN101014674B (de) |
DE (7) | DE102004044086A1 (de) |
ES (4) | ES2323013T3 (de) |
WO (3) | WO2006027388A1 (de) |
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WO2012152713A1 (de) | 2011-05-06 | 2012-11-15 | Tesa Se | Doppelseitiges klebeband mit einer ersten äusseren haftklebrigen und einer zweiten äusseren hitzeaktivierbaren seite |
WO2013048985A2 (en) | 2011-09-26 | 2013-04-04 | 3M Innovative Properties Company | Multilayer pressure-sensitive adhesive films with pressure-sensitive adhesives derived from 2-alkyl alkanols |
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WO2013055581A1 (en) | 2011-10-14 | 2013-04-18 | 3M Innovative Properties Company | Primerless multilayer adhesive film for bonding glass substrates |
WO2013178462A1 (de) | 2012-05-30 | 2013-12-05 | Tesa Se | Doppelseitiges klebeband mit einer ersten äusseren haftklebrigen und einer zweiten äusseren hitzeaktivierbaren seite |
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